Applicable Systems
Octagon 4-Comp
Symptoms
The compressor reports a capacity control fault. The capacity control system is not responding or has lost position feedback.
Possible Causes
- Capacity control solenoid valve stuck or coil failed
- Capacity control linkage binding or mechanically jammed
- Control pressure to the capacity regulator is insufficient
Troubleshooting Steps
- Step 1: Test capacity control solenoid valve coils for continuity
Solenoid coils show proper resistance - Step 2: Inspect the capacity control linkage for free movement
Linkage moves smoothly without binding - Step 3: Verify control oil pressure to the capacity regulator
Control pressure meets the manufacturer specification
How to Reset
To reset: Repair the capacity control system, then reset the fault on the controller.
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Source: Bitzer Screw Compressor Operating Instructions, Bitzer Kuhlmaschinenbau GmbH
Category: Refrigeration
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